#version 330

in vec3 vertexPosition;
in vec2 vertexTexCoord;
in vec3 vertexNormal;
in vec2 vertexTileTexCoord;  
in uvec4 vertexMetadata1;
in uvec4 vertexOcclusionSides;

out vec2 fragTexCoord;
out vec3 fragNormal;
out vec2 fragTileTexCoord;

flat out uvec4 occlusionSides;
flat out int topLeftObscured;
flat out int topRightObscured;
flat out int bottomLeftObscured;
flat out int bottomRightObscured;
flat out int quadHeight;
flat out int quadWidth;

uniform mat4 mvp;

void main() {
	fragTexCoord = vertexTexCoord;
  fragTileTexCoord = vertexTileTexCoord;
  fragNormal = vertexNormal;
  occlusionSides = vertexOcclusionSides;
  gl_Position = mvp*vec4(vertexPosition, 1.0);

  // metadata 1 parsing
  int metadata1W = int(vertexMetadata1.x);
  topLeftObscured     = (metadata1W & 0x1);       // Take 0th bit.
  topRightObscured    = (metadata1W & 0x2) >> 1;  // Take 1st bits.
  bottomLeftObscured  = (metadata1W & 0x4) >> 2;  // Take 2nd bits.
  bottomRightObscured = (metadata1W & 0x8) >> 3;  // Take 3rd bits.
  quadHeight = (metadata1W & 0x3f0) >> 4;         // Take 4rd-9th bits.
  quadWidth  = (metadata1W & 0xfc00) >> 10;       // Take 10th-16th bits.
}